JUC四个函数式接口

1public class Demo01 {
2    public static void main(String[] args) {
3        Function<String, Integer> function = s -> {
4            return s.length();
5        };
6
7
8        System.out.println(function.apply("aa"));
9    }
10
11
12public class Demo02 {
13    public static void main(String[] args) {
14        Predicate<String> predicate = (str) -> {
15            return str.isEmpty();
16        };
17
18        System.out.println(predicate.test("a"));
19    }
20
21
22public class Demo03 {
23    public static void main(String[] args) {
24        Supplier<String> supplier = () -> {
25            return "a";
26        };
27        System.out.println(supplier.get());
28        Consumer<String> consumer = (s) -> {
29            System.out.println(s);
30        };
31        System.out.println(consumer);
32    }